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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2003 Atheros Communications, Inc., All Rights Reserved.
* Copyright (C) 2006 FON Technology, SL.
* Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
* Copyright (C) 2006-2009 Felix Fietkau <nbd@openwrt.org>
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/irq_cpu.h>
#include <asm/reboot.h>
#include <asm/bootinfo.h>
#include <asm/time.h>
#include <ath25_platform.h>
#include "devices.h"
#include "ar5312.h"
#include "ar2315.h"
void (*ath25_irq_dispatch)(void);
static inline bool check_radio_magic(const void __iomem *addr)
{
addr += 0x7a; /* offset for flash magic */
return (__raw_readb(addr) == 0x5a) && (__raw_readb(addr + 1) == 0xa5);
}
static inline bool check_notempty(const void __iomem *addr)
{
return __raw_readl(addr) != 0xffffffff;
}
static inline bool check_board_data(const void __iomem *addr, bool broken)
{
/* config magic found */
if (__raw_readl(addr) == ATH25_BD_MAGIC)
return true;
if (!broken)
return false;
/* broken board data detected, use radio data to find the
* offset, user will fix this */
if (check_radio_magic(addr + 0x1000))
return true;
if (check_radio_magic(addr + 0xf8))
return true;
return false;
}
static const void __iomem * __init find_board_config(const void __iomem *limit,
const bool broken)
{
const void __iomem *addr;
const void __iomem *begin = limit - 0x1000;
const void __iomem *end = limit - 0x30000;
for (addr = begin; addr >= end; addr -= 0x1000)
if (check_board_data(addr, broken))
return addr;
return NULL;
}
static const void __iomem * __init find_radio_config(const void __iomem *limit,
const void __iomem *bcfg)
{
const void __iomem *rcfg, *begin, *end;
/*
* Now find the start of Radio Configuration data, using heuristics:
* Search forward from Board Configuration data by 0x1000 bytes
* at a time until we find non-0xffffffff.
*/
begin = bcfg + 0x1000;
end = limit;
for (rcfg = begin; rcfg < end; rcfg += 0x1000)
if (check_notempty(rcfg) && check_radio_magic(rcfg))
return rcfg;
/* AR2316 relocates radio config to new location */
begin = bcfg + 0xf8;
end = limit - 0x1000 + 0xf8;
for (rcfg = begin; rcfg < end; rcfg += 0x1000)
if (check_notempty(rcfg) && check_radio_magic(rcfg))
return rcfg;
return NULL;
}
/*
* NB: Search region size could be larger than the actual flash size,
* but this shouldn't be a problem here, because the flash
* will simply be mapped multiple times.
*/
int __init ath25_find_config(phys_addr_t base, unsigned long size)
{
const void __iomem *flash_base, *flash_limit;
struct ath25_boarddata *config;
unsigned int rcfg_size;
int broken_boarddata = 0;
const void __iomem *bcfg, *rcfg;
u8 *board_data;
u8 *radio_data;
u8 *mac_addr;
u32 offset;
flash_base = ioremap_nocache(base, size);
flash_limit = flash_base + size;
ath25_board.config = NULL;
ath25_board.radio = NULL;
/* Copy the board and radio data to RAM, because accessing the mapped
* memory of the flash directly after booting is not safe */
/* Try to find valid board and radio data */
bcfg = find_board_config(flash_limit, false);
/* If that fails, try to at least find valid radio data */
if (!bcfg) {
bcfg = find_board_config(flash_limit, true);
broken_boarddata = 1;
}
if (!bcfg) {
pr_warn("WARNING: No board configuration data found!\n");
goto error;
}
board_data = kzalloc(BOARD_CONFIG_BUFSZ, GFP_KERNEL);
if (!board_data)
goto error;
ath25_board.config = (struct ath25_boarddata *)board_data;
memcpy_fromio(board_data, bcfg, 0x100);
if (broken_boarddata) {
pr_warn("WARNING: broken board data detected\n");
config = ath25_board.config;
if (is_zero_ether_addr(config->enet0_mac)) {
pr_info("Fixing up empty mac addresses\n");
config->reset_config_gpio = 0xffff;
config->sys_led_gpio = 0xffff;
eth_random_addr(config->wlan0_mac);
config->wlan0_mac[0] &= ~0x06;
eth_random_addr(config->enet0_mac);
eth_random_addr(config->enet1_mac);
}
}
/* Radio config starts 0x100 bytes after board config, regardless
* of what the physical layout on the flash chip looks like */
rcfg = find_radio_config(flash_limit, bcfg);
if (!rcfg) {
pr_warn("WARNING: Could not find Radio Configuration data\n");
goto error;
}
radio_data = board_data + 0x100 + ((rcfg - bcfg) & 0xfff);
ath25_board.radio = radio_data;
offset = radio_data - board_data;
pr_info("Radio config found at offset 0x%x (0x%x)\n", rcfg - bcfg,
offset);
rcfg_size = BOARD_CONFIG_BUFSZ - offset;
memcpy_fromio(radio_data, rcfg, rcfg_size);
mac_addr = &radio_data[0x1d * 2];
if (is_broadcast_ether_addr(mac_addr)) {
pr_info("Radio MAC is blank; using board-data\n");
ether_addr_copy(mac_addr, ath25_board.config->wlan0_mac);
}
iounmap(flash_base);
return 0;
error:
iounmap(flash_base);
return -ENODEV;
}
static void ath25_halt(void)
{
local_irq_disable();
unreachable();
}
void __init plat_mem_setup(void)
{
_machine_halt = ath25_halt;
pm_power_off = ath25_halt;
if (is_ar5312())
ar5312_plat_mem_setup();
else
ar2315_plat_mem_setup();
/* Disable data watchpoints */
write_c0_watchlo0(0);
}
asmlinkage void plat_irq_dispatch(void)
{
ath25_irq_dispatch();
}
void __init plat_time_init(void)
{
if (is_ar5312())
ar5312_plat_time_init();
else
ar2315_plat_time_init();
}
unsigned int get_c0_compare_int(void)
{
return CP0_LEGACY_COMPARE_IRQ;
}
void __init arch_init_irq(void)
{
clear_c0_status(ST0_IM);
mips_cpu_irq_init();
/* Initialize interrupt controllers */
if (is_ar5312())
ar5312_arch_init_irq();
else
ar2315_arch_init_irq();
}
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